判断用户界面是ipad的还是phone的代码

- (void)applicationDidFinishLaunching:(UIApplication *)application
{
NSString *nibTitle = @"PadContent";
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
nibTitle = @"PhoneContent";
    }
    [[NSBundle mainBundle] loadNibNamed:nibTitle owner:self options:nil];
    
    [self.window addSubview:self.contentController.view];
[window makeKeyAndVisible];
}